Anger… fear… aggression. The dark side are they. Easily they flow, quick to join you in a fight. If once you start down the dark path, forever will it dominate

Anger… fear… aggression. The dark side are they. Easily they flow, quick to join you in a fight. If once you start down the dark path, forever will it dominate your destiny, consume you it will, as it did Obi-Wan’s apprentice. -- Master Yoda, Return of the Jedi